Photo AI
Kinetic theory describes the behaviour of particles in solids, liquids and gases - Edexcel - GCSE Physics - Question 4 - 2017 - Paper 1
Question 4
Kinetic theory describes the behaviour of particles in solids, liquids and gases. (a) Complete the sentence by putting a cross (X) in the box next to your answer. ... show full transcript
Worked Solution & Example Answer:Kinetic theory describes the behaviour of particles in solids, liquids and gases - Edexcel - GCSE Physics - Question 4 - 2017 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
Answer
In the liquid state, particles are B can move past each other. This indicates that, unlike solids where particles are tightly bound in a fixed position, liquids allow particles to flow and slide over one another.
Step 2
Explain how the gas in the cylinder exerts pressure.
Answer
The gas exerts pressure on the walls of the cylinder by colliding with them. As gas particles move randomly and rapidly, they hit the walls, transferring momentum during these collisions. This results in a force applied over the area of the walls, thereby creating pressure. The greater the number of collisions and the speed of the particles, the higher the pressure exerted.
Step 3
Explain why the pressure of the gas inside the cylinder increases if the cylinder gets hot.
Answer
When the cylinder heats up, the temperature of the gas increases. According to the kinetic theory, this means that the particles gain kinetic energy and move faster. As they move more quickly, they collide with the walls of the cylinder more frequently and with greater force, leading to an increase in pressure. Moreover, this can be expressed with the ideal gas law, which states that pressure is directly proportional to temperature when volume is constant.